Coal blending method for blast furnace coal injection

A blast furnace coal injection and coal blending technology, which is applied to the blast furnace coal injection field, can solve the problems of fluctuation of blast furnace coal injection quality, easy blockage of chute screens of the coal injection system, and difficulty in handling, etc., so as to stabilize raw materials, realize coal injection quality, The effect of lower cost per ton of coal

Active Publication Date: 2013-08-21
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of fine particle size, high volatile matter and ash content of this kind of powdered coal, the quality of blast furnace coal injection fluctuates relatively large, and the chute and screen of the coal injection system are easily blocked, and the treatment is difficult, which affects the improvement of blast furnace coal blending capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment is a coal blending method for blast furnace injection coal, which is mixed according to the following coal types in weight percentage: first anthracite: 20%, second anthracite: 15%, third anthracite: 15%, bituminous coal: 25%, Powdered coal: 25%.

[0014] The first anthracite is Vdaf: 9.0%, Ad: 10.50%, Std: 0.47%, fixed carbon: 81% anthracite; the second anthracite is Vdaf: 9.6%, Ad: 10.45%, Std: 0.52%, fixed carbon: 80 % anthracite; the third anthracite is Vdaf: 9.1%, Ad: 11.63%, Std: 0.50%, fixed carbon: 80% anthracite.

[0015] Bituminous coal is Vdaf: 34.84%, Ad: 6.62%, Std: 0.49%, fixed carbon: 58.82% bituminous coal; powdered coal is Vdaf: 13.4%, Ad: 11.03%, Std: 0.42%, fixed carbon: 76.5% powder coal.

Embodiment 2

[0017] This embodiment is a coal blending method for blast furnace injection coal, which is mixed according to the following coal types by weight percentage: first anthracite: 25%, second anthracite: 20%, bituminous coal: 25%, powder coal: 30%.

[0018] The first anthracite is Vdaf: 9.0%, Ad: 10.50%, Std: 0.47%, fixed carbon: 81% anthracite; the second anthracite is Vdaf: 9.6%, Ad: 10.45%, Std: 0.52%, fixed carbon: 80 % of anthracite.

[0019] Bituminous coal is Vdaf: 34.84%, Ad: 6.62%, Std: 0.49%, fixed carbon: 58.82% bituminous coal; powdered coal is Vdaf: 13.4%, Ad: 11.03%, Std: 0.42%, fixed carbon: 76.5% powder coal.

Embodiment 3

[0021] This embodiment is a coal blending method for blast furnace injection coal, which is mixed according to the following coal types in weight percentage: first anthracite: 22%, second anthracite: 17%, third anthracite: 9%, bituminous coal: 30%, Powdered coal: 22%.

[0022] The first anthracite is Vdaf: 9.0%, Ad: 10.50%, Std: 0.47%, fixed carbon: 81% anthracite; the second anthracite is Vdaf: 9.6%, Ad: 10.45%, Std: 0.52%, fixed carbon: 80 % anthracite; the third anthracite is Vdaf: 9.1%, Ad: 11.63%, Std: 0.50%, fixed carbon: 80% anthracite.

[0023] Bituminous coal is Vdaf: 34.84%, Ad: 6.62%, Std: 0.49%, fixed carbon: 58.82% bituminous coal; powdered coal is Vdaf: 13.4%, Ad: 11.03%, Std: 0.42%, fixed carbon: 76.5% powder coal.

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Abstract

The invention relates to a coal blending method for blast furnace coal injection, which comprises the step of mixing the following coal varieties in percentage by weight: 20-25% of first blind coal, 15-20% of second blind coal, 0-15% of third blind coal, 25-30% of soft coal and 25-30% of powder coal, wherein the sum of weight percents of all the coal varieties is 100%; the first blind coal is one comprising 9.0% of Vdaf, 10.50% of Ad, 0.47% of Std and 81% of fixed carbon; the second blind coal is one comprising 9.6% of Vdaf, 10.45% of Ad, 0.52% of Std and 80% of fixed carbon; and the third blind coal is one comprising 9.1% of Vdaf, 11.63% of Ad, 0.50% of Std and 80% of fixed carbon. According to the invention, the blockage of equipment such as a chute, screen or the like of a coal injection system can be reduced, the coal injection quality can be stabilized, and the coal injection cost can be lowered.

Description

technical field [0001] The invention belongs to the blast furnace coal injection technology in the field of metallurgy, in particular to a blast furnace injection coal coal blending method. Background technique [0002] In recent years, in order to reduce the cost of blast furnace PCI coal, some powdered coal with relatively cheap price and slightly lower quality has been introduced as blast furnace PCI coal. However, due to the fine particle size, high volatile matter and ash content of this kind of powdered coal, the quality of blast furnace coal injection fluctuates greatly, and the chute and screen of the coal injection system are easily blocked, making it difficult to handle, which affects the improvement of blast furnace coal blending capacity. . Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a blast furnace injection coal blending method to reduce the blockage of equipment such as chutes and screens in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 徐兴福万华李致忠马宇
Owner NANJING IRON & STEEL CO LTD
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